Renewable cartridge fuse



Dec. 30, 1947. o. w. SMITH 2,433,792

RENEWABLE CARTRIDGE FUSE Filed Nov. 30, 1943 2 Sheets-Sheet 1 WWW Dec.30, 1947. o. w. SMITH 2,433,792

RENEWABLE CARTRIDGE FUSE Filed Nov. 30, 1943 2 Sheets-Sheet 2 PatentedDec. 30, 1947 UNITED STATES PATENT OFFICE RENEWABLE CARTRIDGE 'FUsE OmerW. Smith, owensboro, Application November so, 194:, Serial No. 512,305

4 Claims. 9 (Cl. 200-131) This invention relates to renewable cartridgefuses.

An object of the present invention is to provide a cartridge fusewherein the fuse link may be easily and quickly replaced.

Another object of the present invention is to provid a cartridge fuse inwhich the case is made of a transparent material, thereby enabling upona. glance the determination of the condition of the contained fuse link.

A further object of the present invention is to provide a cartridge fusewhich includes fewer parts and is cheaper to manufacture than the fusesas heretofore produced.

Other objects and advantages will be apparent from the followingdescription of the illustrative embodiments of fuses according to thepresent invention as shown in the accompanying drawings, wherein:

Figure l is a side elevational view of a cartridge fuse according to thepresent invention.

Figure 2 is a plan view of the cartridge fuse shown in Figure 1.

Figure 3 is a side elevational view, in section, taken on the line 33 ofFigure 2.

Figure 4 is a side elevational view of a modification of the cartridgefuse shown in Figure 1.

Figure 5 is a plan view of the cartridge fuse shown in Figure 4.

Figure 6 is a sectional view taken on the line 6-4 of Figure 5.

Figure 7 is a partial side elevational view, in section, of the upperportion of the cartridge fuse shown in Figure 4.

Referring to Figures 1 to 3 inclusive of the drawings, the numeral Iindicates the case which is molded of a suitable plastic or glass eitherclear or colored. Although the case is shown as being rectangular inshape, it may be of cylindrical form. Moulded into the ends of the caseI and passing through apertures in said ends are the copper terminals 2.The terminals are positioned with respect to the case by molding thecase around the terminals so that an integral unit will be formed. Eachof the terminals 2 is provided with a shelf member 8 having a threadedaperture 1 adapted to receive a post or headed screw 5 therein. Thescrews 5 in each of the shelf members of the terminals 2 are for thepurpose of detachably securing the ends of a fuse link 8 to theterminals 2, said link extending between the shelf members in ahorizontal plane parallel to the base of the case 'I. The case I isprovided with a cover 4 which may be of a material similar to thatemployed in fabrlcating the case and which is detachably secured to thetop of the terminals 2 by means of screws 3 passing through countersunkapertures in the cover, with the threaded end of each of said screwsbeing in threaded engagement with a complemental threaded opening in thetop of each of the terminals 2.

In the modification of the'cartridge fuse according to the presentinvention as shown in Figures 4 to '7 inclusive, the copper terminals I2extend into the plain or colored transparent case II. As was the casewith the form of the invention shown in Figures 1 through 3, the case iscomposed of plastic or glass, either clear or colored, and is moldedabout the terminals I2 so as to form a single'unit of rigidconstruction. Each of the terminals I2 is provided with a shelf memberI6, Figure 6, having a threaded opening II in th top thereof. In theshelf member I6 of each of the terminals, there is a groove I8 extendingtransversely therethrough, said groove being contiguous to an inclinedwall I9 on the free end of the terminal.

Extending from one of the shelf members I6 to'the other shelf member I6of the terminals I2 is a fuse link 20, each end of the said link beingmounted so that its bottom edge is supported in the groove I8 and itsunder face bears against the inclinedwall I9 as clearly shown in Figure6. The thus mounted end is detachably secured to the terminal I2 bymeans of a wedg block 2| and a post or headed screw I5, said screwpassing through opening 22 in the wedge block 2| and having its endthereof in threaded engagement with the threaded opening I! in the shelfmember IS.

The case II, Figure 7, is provided with a cover II of a material similarto that composing the case I I, which is detachably secured to the topof the terminals I2 by means of spring clips 23 and 24 carried by rivetsI3 mounted in the cover I4, the spring clip 23 engaging a slot 25 in oneof the terminals and the spring clip 24 having its free end inengagement with the under side of a metal strip 26 carried by theopposing terminal.

Having fully described the invention, what I v claim as new and desireto secure by Letters Patent is:

l. A renewable cartridge fuse, comprising: an

elongated hollow body portion of moulded insulating material having endportions and a wall portion providing an open side; a pair of endterminals of conducting material, one of said terminals extending intosaid hollow body through each end portion thereof, said body meanshaving its end portions moulded about said terminals and having aportion of insulating material extending over each of said terminals andcooperating with said wall portion to form a boundary for said openside, said terminals having seat portions for receiving the ends of afuse link extending between said terminals; means for detachablysecuring the ends of said fuse link to said seat portions; a covermember of transparent insulating material having edge portions fittingthe boundary of said open side to close said hollow body; and means fordetachably securing said cover member in position on said body member.

2. A renewable cartridge fuse, comprising: an elongated hollow bodyportion of moulded insulating material having end portions and a wallportion providing an open side; a pair of end terminals of conductingmaterial, one of said terminals extending into said hollow body througheach end portion thereof said body having its end portions moulded aboutsaid terminals and having a portion of insulating material extendingover each of said terminals and cooperating with said wall portion toform a boundary for said open side, said terminals having seat portionsfor receiving the ends of a fuse link extending between said terminals;means for detachably securing the ends of said fuse link to said seatportions; a cover member of transparent insulating material having edgeportions fitting the boundary of said open side to close said hollowbody; and threaded means received by said terminals for detachablysecuring said cover member in position on said body member.

3. A renewable cartridge fuse comprising: a pair of terminal membershaving a seat portion; a case of insulating material molded around saidterminal members so as to form an integral structure and inclose saidseat portion, each seat portion having a wall extending at an anglethereto and arranged transversely thereof; a fuse link arranged in saidcase so that the opposite ends thereof engage said inclined walls; meansfor detachably securing said fuse link to each of said terminal membersincluding a block having an inclined surface engaging said fuse link andmeans for securing the same to the seat portion of its associatedterminal member; and means for detachably securing a transparent coverplate over said fuse link including spring clips in association withcomplemental means of said terminals.

4. A renewable cartridge fuse, comprising: a pair of terminal memberseach having a seat portion; a case of insulating material molded aroundsaid terminal members to form an integral structure and inclose saidseat portions, each of said seat portions having a groove extendingtransversely thereof, each of said terminal members also having a wallextending upwardlyand outwardly from its transverse groove: a fuse linkarranged in said case so that the opposite ends thereof engage saidinclined walls and also rest in said grooves; and means for detachablysecuring said fuse link to each of said terminal members including ablock having an inclined surface engaging said fuse link and a fasteningmember extending through said block and securing the same to the seatportion of its associated terminal member.

OMER W. SMITH.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 281,576 Stieringer July 17, 1883332,286 Pfannkuche Dec. 15, 1885 512,331 Seymour Jan. 9, 1894 994,566Bernardinl June 6, 1911 1,173,889 Steelman Feb. 29, 1916 1,228,408Cleaver June 5, 1917 1,234,100 Morgan July 17, 1917 1,245,863 BronsonNov. 6, 1917 1,447,150 Pierce et al. Feb. 27, 1923 1,494,141 Snow May13, 1924 1,537,296 Gearhart May 12, 1925 1,632,316 Savoy June 14, 19271,703,236 Hickey Feb. 26, 1929 2,168,016 Hanny Aug. 1, 1939 2,193,691Johnson et a1 Mar. 12, 1940 2,195,147 Griflith Mar. 26, 1940

